The decomposition of ozone is the stratosphere can occur by the following two-st

Question

The decomposition of ozone is the stratosphere can occur by the following two-step mechanism: Br + O_3 rightarrow BrO + O rightarrow Br + O_2 which species is an intermediate in this mechanism? A. Br B. BrO C. O D. O_3 Calculate K_c for the reaction 2 Hl (g) - H_2 (g) - H_2 (g) + I_2 (g) given that the concentrations of each species at equilibrium are as follows: [HI] = 0.85 mol/L. [I_2] = 0.27 mol/L. A. 5.25 B. 0.22 C.4.5 D. 0.19 E. 1.6 times 10^2 Calculate K_p for reaction 2NOCl (g) - 2 NO (g) + Cl_2 (g) at 400 degree C for this reaction is 2.1 times 10^-2 A. 2.1 times 10^-2 B. 1.7 times 10^-3 C. 0.70 D. 1.2 E. 3.8 times 10^-4

Explanation / Answer

20) the species which is formed in one step and is consumed in some other step is called as intermediate

so in the given reaction BrO is the intermediate

21) Kc for the reaction will be

Kc = [H2] [I2] / [HI]2

Kc = 0.27 X 0.6 / (0.85)^1/2 = 0.224 = 0.22

22) We know that

Kp = Kc (RT)n

Where

n = number of moles of gaseous products - number of moles of gaseous reactants

Here n = 3-2 =1

R= gas constant= 0.0821 L atm /mol K

T= temperature = 400 C = 400 +273 K = 673K

Kp = 2.1 X 10^-2 (0.0821 X 673) = 1.160 = 1.2

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